You could probably put it in a ventilated cabinet but the big question is,is the transformer rated for continuous duty?
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I have the Military Cardmatic(USM-118B)version of the Hickok testers and the scale on my meter is from 0 to 100. I have a test condition book that tells me the micromhos for a 12AX7 on this tester at full scale (100) would be 1600. My 12AX7s all test around 75 to 78 (math translation 75% to 78% of 1600 - 1200 to 1250 micromhos). I am comfortable with these numbers but it took me some time to realize many other testers and tester types will have very different numbers as being "good" mutual conductance.